I haven't asked my dealer this question yet, and I plan on doing just that. Figured there may be someone on the board here who has first-hand experience with this model - I will be getting my 2007 J-210 (round) spa in a few weeks, and in planning the location in my backyard my ever-observant wife asked me whether it makes enough noise to be concerned about. The location is within 10-15 feet or so of our bedroom windows that we might want to leave open at night in the summer. I told her I have no idea what sort of noises this tub makes - just assumed since it's a Jacuzzi they've already thought of all that and it shouldn't be a problem.
But... it did get me thinking. Anyone have any first hand experience with this one? Thanks!